Characteristics of face-centered cubic metals processed by equal-channel angular pressing

Chinh, Nguyen Q.; Gubicza, Jenő; Langdon, Terence G.

doi:10.1007/s10853-006-0900-3

Cited by 94 publications

(42 citation statements)

References 91 publications

(108 reference statements)

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“…For example, in Cu when the grain size is reduced to the range ~20-100 nm the Hall-Petch slope, k H , decreases [31]. This breakdown of Hall-Petch behavior is usually explained by the grain size dependence of the stress required to operate a Frank-Read source [34] and the strong reduction in the numbers of dislocations in pile-ups with decreasing grain size [35].…”

Section: Dislocation Density and The Hall-petch Relationshipmentioning

confidence: 99%

Microstructure, phase composition and hardness evolution in 316L stainless steel processed by high-pressure torsion

Gubicza

El-Tahawy

Huang

et al. 2016

Materials Science and Engineering: A

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A 316L stainless steel was processed by high-pressure torsion (HPT) to evaluate the grain refinement and phase transformation. The initial material was essentially a single phase γ-austenite with a coarse-grained microstructure of ~42 µm but the grain size was reduced to ~45 nm after 10 turns of HPT. In addition, there was a phase transformation and the initial γ-austenite transformed initially to ε-martensite and finally to α'-martensite with increasing strain. The dislocation density increased to an exceptionally high value, of the order of ~10 16 m -2 , in the main α'-martensite phase after 10 HPT revolutions. The formation of the multiphase nanocrystalline microstructure yielded a four-fold increase in hardness to reach an ultimate value of ~6000 MPa. The Hall-Petch behavior of the HPT-processed alloy is compared directly with coarse-grained materials.

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Section: Dislocation Density and The Hall-petch Relationshipmentioning

confidence: 99%

Microstructure, phase composition and hardness evolution in 316L stainless steel processed by high-pressure torsion

Gubicza

El-Tahawy

Huang

et al. 2016

Materials Science and Engineering: A

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“…They found that crystals with larger dislocation density were harder [22]. It has been shown for different pure face-centered cubic (fcc) metals processed by Equal Channel Angular Pressing (ECAP) that the dislocation density increases while grain size decreases with increasing strain and ultimately these parameters reach saturation values [23]. Above a certain grain size limit (~20 nm) the strength of materials increases with decreasing grain size [24].…”

Section: Xrd-dislocation Density and Theoretical Densitymentioning

confidence: 99%

Konjac Biomolecules Assisted–Rod/Spherical Shaped Lead Nano Powder Synthesized by Electrolytic Process and Its Characterization Studies

Thirugnanasambandan¹,

Alagar²

2013

Nano BioMed ENG

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Synthesis and structural characterization of Pb nanoparticles by electrolysis using a bioactive compound-konjac aqueous extract is the main aim of this study. This method is a unique, novel, low cost and double-step procedure with good reproducibility and has not been used for nanoparticles preparation so far. Konjac extract has been added to prevent the oxidation of Pb nanoparticles. Also the synthesized nanoparticles have been dried in open air to observe their stability. Various types of characterization tools have been utilized to study characters of the end product. Anti-bacterial Studies has also been done. After completion of synthesis process that we have made an attempt to change the shape of the synthesized nanoparticles by the influence of sunbeams and to find the effects of the sunlight on nanomaterials.Keywords: XRD, Lead nanopowder, Konjac, Electrolysis, Debye-Scherer Citation: T. Theivasanthi and M. Alagar. Konjac biomolecules assisted-rod/spherical shaped lead nano powder synthesized by electrolytic process and its characterization Studies.

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“…Similarly , dislocation density ( δ ) and microstrain ( є ) were also calculated [13,14 ] respectively using :-The average grain size of crystallite domain calculated from Scherer data comes out to be 2.4 nm . Coherently , dislocation density and microstrain comes out to be ( D = 8 A 0 ) 0.014 * 10 14 lin 2 / m 2 and 0.0299 respectively and found to be in agreement with reported literature [15,16] .…”

Section: Fig 1 Powder Xrd Graph Of Stable Alpha (α ) Phase Alumina Namentioning

confidence: 99%

Effect of Cryogenic Treatment on Alumina Nanoporous Material

Sharma¹

2017

IJRET

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( -196 0 Celsius ) for 6-7 hours and left at normal temperature for 3-4 hours before further processing . Their characterization study were done using BET ( BEL belsorp ) , XRD( Panalytical.s X.Pert Pro ) and FE SEM ( SU8010 ) . BET shows the formation of porous alumina structure with mean diameter 26.126 nm , whereas the formation of alpha (α) phase crystalline alumina was confirmed by XRD and lastly formation of highly stable 1-D Nanorods were confirmed by FE-SEM images.--

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Characteristics of face-centered cubic metals processed by equal-channel angular pressing

Cited by 94 publications

References 91 publications

Microstructure, phase composition and hardness evolution in 316L stainless steel processed by high-pressure torsion

Microstructure, phase composition and hardness evolution in 316L stainless steel processed by high-pressure torsion

Konjac Biomolecules Assisted–Rod/Spherical Shaped Lead Nano Powder Synthesized by Electrolytic Process and Its Characterization Studies

Effect of Cryogenic Treatment on Alumina Nanoporous Material

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